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Message-ID: <20120822133400.20200.3726.stgit@localhost.localdomain> Date: Wed, 22 Aug 2012 14:34:11 +0100 From: Alan Cox <alan@...rguk.ukuu.org.uk> To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCHv2] kvm: Fix nonsense handling of compat ioctl From: Alan Cox <alan@...ux.intel.com> KVM_SET_SIGNAL_MASK passed a NULL argument leaves the on stack signal sets uninitialized. It then passes them through to kvm_vcpu_ioctl_set_sigmask. We should be passing a NULL in this case not translated garbage. Signed-off-by: Alan Cox <alan@...ux.intel.com> --- virt/kvm/kvm_main.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index a2e85af..cd1fde9a 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1975,9 +1975,10 @@ static long kvm_vcpu_compat_ioctl(struct file *filp, if (copy_from_user(&csigset, sigmask_arg->sigset, sizeof csigset)) goto out; - } - sigset_from_compat(&sigset, &csigset); - r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); + sigset_from_compat(&sigset, &csigset); + r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); + } else + r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); break; } default: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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